Horror trailer music?

I am making a horror movie trailer for media soon, and I would like some of the music for it that starts as a low hum, which builds up to pound at the dramatic moments like is used in many other horror trailers.

Anyone know where I could get music like this for free or cheap?

wen i ask they say that they fall into the habit smhw ........but nyways i think there is a connection smwhere. Now i being a teetollar will not give into this habit nyhw